W-Ti Alloy Prepared by Hydrogen Reduction of Nanometer WO₃-TiH₂ Powders

Abstract:

In this study, TiH₂ and WO₃ powders were co-milled together, then the ultrafine powders were reduced at H₂ atmosphere, and W-Ti alloys were prepared by the solid phase sintering. The main purpose of WO₃ powder instead of the W powder was to use the transition of the lattice type of WO₃, and the lattice distortion and defects in the lattice of W would promote Ti atom diffusing into W. It was easy to form a W-rich solid solution and reduce the effect of Ti-rich phase. The results showed that when the milling time of WO₃-TiH₂ was 24h, the particle size of mixed powder reached nanoscale, and WO₃ particles were coated on the surface of TiH₂ particles. The particle size changed unobviously with the increase of the milling time. The XRD analysis showed that the milled WO₃ and TiH₂ were not decomposed in the milling process. When WO₃-TiH₂ milled powders were decomposed in the H₂ atmosphere at 800, WO₃ reduction was not sufficient, and the middle phase of WO₂ was existed. When the reduction temperature was 850 for 2h, WO₃ was reduced to W, and the phase of WO₂ was disappeared. A small amount of TiO₂ was formed by the decomposed Ti and decomposed O from WO₃. W-10Ti alloys were prepared by the solid-phase sintering with the reduced powders at 850. It was found that the amount of W-rich solid solution in W-10Ti alloy was decreased, because the diffusion of Ti to W was inhibited by a small amount of TiO₂ in grain boundaries during the sintering process.

• Periodical: Materials Science Forum (Volume 749)
• Pages: 316-321
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.749.316
• Online since: March 2013
• Authors: Peng Xiao, Ying Chun Qu, Xiao Hong Yang, Shu Hua Liang
• Keywords: Hydrogen-Reduction, Milling, Solid-Phase Sintering, W-10Ti Alloy

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